Fourthstone reports 384,802 shares (5.22%) in MNSB

MainStreet Bancshares, Inc. ownership disclosure: Fourthstone and affiliated reporting persons disclose beneficial ownership of 384,802 shares of Common Stock, representing 5.22% of the class based on 7,366,049 shares outstanding as of March 6, 2026.

Rhea-AI Filing Summary

MainStreet Bancshares, Inc. ownership disclosure: Fourthstone and affiliated reporting persons disclose beneficial ownership of 384,802 shares of Common Stock, representing 5.22% of the class based on 7,366,049 shares outstanding as of March 6, 2026. The filing states these shares were acquired in the ordinary course of business by Fourthstone as an investment adviser and are not held to change or influence control of the issuer.

Insights

Institutional Ownership Analyst

Fourthstone reports a 5.22% stake in MainStreet Bancshares.

Fourthstone LLC and related entities report beneficial ownership of 384,802 shares, based on 7,366,049 shares outstanding as of March 6, 2026. The filing attributes shared voting and dispositive power across the related entities and names L. Phillip Stone, IV as an affiliated individual.

Filing notes the positions were acquired in the ordinary course by an investment adviser and were not for the purpose of changing control. Subsequent filings would show any change in percentage or voting arrangements.

Corporate Governance Specialist

Disclosure emphasizes passive, non-control intent.

The Reporting Persons certify the securities "were not acquired and are not held for the purpose of or with the effect of changing or influencing the control" of the issuer. The cover pages show shared voting/dispositive power figures for each related entity and person.

Investors tracking ownership should note the 5.22% threshold reported and the filing's reliance on the issuer's March 13, 2026 Form 10‑K for the outstanding share base.

Key Figures

Shares beneficially owned: 384,802 shares Percent of class: 5.22% Shares outstanding (basis): 7,366,049 shares +3 more

6 metrics

Shares beneficially owned 384,802 shares Fourthstone LLC reported beneficial ownership

Percent of class 5.22% Based on 7,366,049 shares outstanding as of March 6, 2026

Shares outstanding (basis) 7,366,049 shares Outstanding as of March 6, 2026 per issuer Form 10-K

Fourthstone Master Opportunity Fund holdings 296,228 shares Reported shared dispositive/voting power

Fourthstone GP LLC holdings 88,574 shares Reported shared dispositive/voting power

Fourthstone QP Opportunity Fund holdings 83,471 shares Reported shared dispositive/voting power

Key Terms

beneficially owned, shared dispositive power, Schedule 13G/A, ordinary course of business

4 terms

beneficially owned regulatory

"Amount beneficially owned: Fourthstone LLC acquired the Issuer's shares in the ordinary course"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared dispositive power regulatory

"Shared Dispositive Power 384,802.00"

Schedule 13G/A regulatory

"This is being filed by Fourthstone LLC, a Delaware Limited Liability Company"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

ordinary course of business regulatory

"acquired the Issuer's shares in the ordinary course of business as a registered investment adviser"

The ordinary course of business means the regular, routine activities a company carries out to operate day-to-day — sales, payroll, supplier orders, customer service and similar predictable tasks. For investors, distinguishing these normal activities from unusual transactions is important because routine actions signal steady operations and predictable cash flow, while departures from the ordinary course (like one‑off deals or emergency costs) can indicate added risk or one-time impacts to earnings, much like household chores versus a sudden home renovation.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does Fourthstone report in MainStreet Bancshares (MNSB)?

Fourthstone and affiliates report beneficial ownership of 384,802 shares, equal to 5.22% of the class based on 7,366,049 shares outstanding as of March 6, 2026. The filing lists shared voting and dispositive power across related entities.

Does Fourthstone intend to influence control of MNSB?

No. The Reporting Persons certify the shares "were not acquired and are not held for the purpose of or with the effect of changing or influencing the control" of the issuer. The filing frames the holdings as acquired in the ordinary course.

Which Fourthstone-related entities are named in the Schedule 13G/A?

Named reporting persons include Fourthstone LLC, Fourthstone Master Opportunity Fund Ltd, Fourthstone GP LLC, Fourthstone QP Opportunity Fund, Fourthstone Small-Cap Financials Fund, and L. Phillip Stone, IV as affiliated individuals and entities.

What voting and dispositive powers are reported?

The cover pages show 0 sole voting/dispositive power and shared voting/dispositive power consistent with the 384,802 aggregate shares reported for Fourthstone LLC; specific per-entity shared powers are listed on each cover page.

What outstanding share figure is the percentage based on?

The 5.22% figure is calculated using 7,366,049 shares of Common Stock outstanding as of March 6, 2026, per the issuer's Form 10-K filed March 13, 2026, as cited in the filing.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/15/2026 - 04:52 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

MainStreet Bancshares, Inc.

(Name of Issuer)

Common Stock, par value $4.00 per share

(Title of Class of Securities)

56064Y100

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 56064Y100

1

Names of Reporting Persons

Fourthstone LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 384,802.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 384,802.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

384,802.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.22 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

CUSIP Number(s): 56064Y100

1

Names of Reporting Persons

Fourthstone Master Opportunity Fund Ltd

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 296,228.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 296,228.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

296,228.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.02 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

CUSIP Number(s): 56064Y100

1

Names of Reporting Persons

Fourthstone GP LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 88,574.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 88,574.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

88,574.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

1.20 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

CUSIP Number(s): 56064Y100

1

Names of Reporting Persons

Fourthstone QP Opportunity Fund LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 83,471.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 83,471.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

83,471.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

1.13 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

CUSIP Number(s): 56064Y100

1

Names of Reporting Persons

Fourthstone Small-Cap Financials Fund LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 5,103.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 5,103.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,103.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0.07 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

CUSIP Number(s): 56064Y100

1

Names of Reporting Persons

L. Phillip Stone, IV

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 384,802.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 384,802.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

384,802.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.22 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: See Item 4 for a description of the information reported in rows (6), (8), (9) and (11).

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MainStreet Bancshares, Inc.
(b)	Address of issuer's principal executive offices: 10089 FAIRFAX BOULEVARD, FAIRFAX, VA, 22030
Item 2.
(a)	Name of person filing: This Schedule 13G is being filed by Fourthstone LLC, a Delaware Limited Liability Company and Investment Adviser ("Fourthstone"). The persons reporting information on this Schedule 13G include, in addition to Fourthstone, a company incorporated in the Cayman Islands ("Fourthstone Master Opportunity Fund"), a Delaware Limited Partnership ("Fourthstone QP Opportunity"), a Delaware Limited Partnership ("Fourthstone Small-Cap Financials"), a Delaware Limited Liability Company ("Fourthstone GP, " General Partner of Fourthstone QP Opportunity and Fourthstone Small-Cap Financials), and L. Phillip Stone, IV, a citizen of the United States of America, who is the Managing Member of Fourthstone and Fourthstone GP (each, a "Reporting Person" and, together, the "Reporting Persons"). Fourthstone directly holds 384,802 shares of Common Stock on behalf of its advisory clients. Each of the Reporting Persons listed in this filing certify the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the Issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that effect.
(b)	Address or principal business office or, if none, residence: The principal business address of each of the Reporting Persons is as follows: The registered office of Fourthstone LLC, Fourthstone Master Opportunity Fund Ltd., Fourthstone GP LLC, Fourthstone QP Opportunity Fund LP, Fourthstone Small-Cap Financials Fund LP is 575 Maryville Centre Drive, Suite 110, St. Louis, MO 63141.
(c)	Citizenship: See response to Item 4 of each of the cover pages.
(d)	Title of class of securities: Common Stock, par value $4.00 per share
(e)	CUSIP No.: 56064Y100
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: Fourthstone LLC acquired the Issuer's shares in the ordinary course of business as a registered investment adviser and not with the purpose nor with the effect of influencing the control of the Issuer. Fourthstone GP LLC is the general partner of and may be deemed to beneficially own securities owned by Fourthstone QP Opportunity Fund LP and Fourthstone Small-Cap Financials Fund LP. L. Phillip Stone, IV, is the Managing Member of Fourthstone LLC and Fourthstone GP and may be deemed to beneficially own securities owned by Fourthstone. The percentages reported in Row 11 of each cover page are based on 7,366,049 shares of Common Stock (as defined below) of the Issuer (as defined below) outstanding as of March 6, 2026, based on the Issuer's Form 10-K filed on March 13, 2026.
(b)	Percent of class: 5.22 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See responses to Item 5 on each cover page.
	(ii) Shared power to vote or to direct the vote: See responses to Item 6 on each cover page.
	(iii) Sole power to dispose or to direct the disposition of: See responses to Item 7 on each cover page.
	(iv) Shared power to dispose or to direct the disposition of: See responses to Item 8 on each cover page.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Fourthstone LLC

Signature:	Amy M. Stone
Name/Title:	Chief Executive Officer
Date:	05/15/2026

Fourthstone Master Opportunity Fund Ltd

Signature:	Amy M. Stone
Name/Title:	Chief Executive Officer
Date:	05/15/2026

Fourthstone GP LLC

Signature:	L. Phillip Stone, IV
Name/Title:	Managing Member of Fourthstone GP LLC
Date:	05/15/2026

Fourthstone QP Opportunity Fund LP

Signature:	Amy M. Stone
Name/Title:	Chief Executive Officer
Date:	05/15/2026

Fourthstone Small-Cap Financials Fund LP

Signature:	Amy M. Stone
Name/Title:	Chief Executive Officer
Date:	05/15/2026

L. Phillip Stone, IV

Signature:	L. Phillip Stone, IV
Name/Title:	Self, Principal owner of Fourthstone LLC
Date:	05/15/2026